The Efficient Heating System (EHS) is a flexible plant solution which maximizes the efficiency of the billet pre-heating by combining different energy sources. The process route is tailored to local energy cost patterns and source availability. The electric heating through high-performance induction units allows a significant reduction of scale generation.
Primetals Technologies has installed or upgraded more than 500 rolling mills on six continents. These mills have set worldwide benchmarks for technological leadership, reliability and performance.
Efficient Heating System for billets
The Efficient Heating System (EHS) combines different energy sources for billet re-heating in a flexible plant solution which maximizes the efficiency of operation, and minimizes the energy consumption. The billet heating route is flexibly adapted to local energy cost patterns and source availability. From the most conventional heating route via a fossil-fuel furnace, to the full direct charge to a high-performance induction furnace for temperature equalization and boost, all the combinations of hot- and cold- charge with fossil-fuel and induction furnace are simulated by the EHS proprietary tool, in order to define the final optimum route.
During the conventional heating process of the billet, there is a significant generation of scale which is detrimental to the metallic yield, and represents an important amount of lost production. With the integrated operation of fossil-fuel and induction furnaces provided by EHS, the staying time of the billet at the different temperatures may be adjusted and controlled, so to significantly reduce its oxidation and the corresponding formation of scale.
The power control and process automation of EHS can be effectively integrated with the advanced thermo-metallurgical models available in the rolling mill, for the control of thermal profile accuracy of the rolled stock, the process compression and the enhancement of product quality.